张衡与托勒密天文学思想的哲学基础之比较     

王仁宇 《南阳师范学院学报》2002,1(5):6-9

张衡是中国古代博学的天学家，托勒密是西方古代学的集大成,他们的天学理论受中西古代哲学思想的影响很深，比较他们哲学思想的异同对于中西化的比较与交流都是十分有意义的事。具体来讲，张衡的天学思想的哲学基础是中国古代的天人合一理论、气一元论和阴阳五行论以及群体本位主义；而托勒密的天学思想的哲学基础是毕达哥拉斯的天体运动正圆说、柏拉图的世界二分法和源于古希腊的人类中心论和个体本位主义。张衡与托勒密天学思想的差异深深地植根于中西早期化的差异之中。  相似文献   

Measurement of conversion efficiency of soft X-ray from 0.35μm laser-irradiated aluminum planar targets     

Shu-xi Ren  Hong-liang Ma Ph. D.  Rong-qing Yi  Shen-ye Liu 《上海大学学报(英文版)》2006,10(3):224-227

Conversion efficiency of soft X-ray from 0.35 μm pulse laser-irradiated aluminium planar target at laser intensities 10¹³–10¹⁵ W/cm² on the Xingguang-II facility (laser energy 5–90 J, focal spot ⊃ Ф 200 μm full width of half maximun (FWHM) 400–800 ps) was measured. A simple model was given to explain soft X-ray conversion efficiency. In this model, because of the heat conduction from the laser-heated spot, the conversion was very small at lower irradiance limit, while at higher limit it was bounded by the energy lost in blow off plasma. Consequently, at the laser intensity around 2×10¹⁴ W/cm², the X-ray conversion efficiency reaches a maximum. Project suppoted by Shanghai Leading Academic Discipline Foundation (Grant No. T0104), and Science Foundation of Shanghai Municipal Commission of Education (Grant No. 214680)  相似文献   

用直接代数法研究一些特殊非线性系统的行波激发模式     

叶健芬  任清褒 《丽水学院学报》2005,27(5):42-45

运用直接代数法研究一些特殊非线性系统:sine-Gordon系统和Bullough-Mikhailov系统的行波激发模式,得到了上述系统的孤波解、周期波解和双周期波解。  相似文献   

Random vibration analysis of switching apparatus based on Monte Carlo method     

ZHAI Guo-fu CHEN Yang-hua REN Wan-bin 《浙江大学学报(A卷英文版)》2007,8(3):422-425

The performance in vibration environment of switching apparatus containing mechanical contact is an important element when judging the apparatus’s reliability. A piecewise linear two-degrees-of-freedom mathematical model considering contact loss was built in this work, and the vibration performance of the model under random external Gaussian white noise excitation was investigated by using Monte Carlo simulation in Matlab/Simulink. Simulation showed that the spectral content and statistical characters of the contact force coincided strongly with reality. The random vibration character of the contact system was solved using time (numerical) domain simulation in this paper. Conclusions reached here are of great importance for reliability design of switching apparatus.  相似文献   

Competencies evaluation in engineering programmes     

Mario F. Letelier  José A. Herrera  Andrea M. Canales  Rosario Carrasco  Lorena L. López 《European Journal of Engineering Education》2003,28(3):275-286

Results are reported in this paper from a study aimed at evaluating significant competencies in final-year students of some engineering programmes in Chile. The study was carried out by a group of eight universities that were interested in exploring ways to assess learning outcomes such as those demanded by the recent Chilean accreditation system. The authors actively participated in all stages of the study, contributing directly to the design, application and results evaluation of some tests. A sample of 150 students was tested, under conditions that guaranteed the comparability of results. In this paper the authors present results relating to the evaluation of effective communication. The study was backed up by a conceptual model and some hypotheses that are explained and discussed in this work.  相似文献   

基于知识媒体的建构主义学习环境设计     

任锐 《中国现代教育装备》2007,(3):114-116

学习环境设计是教学理论领域的两大主题之一。随着知识媒体概念的提出及不断发展,它对学习环境的影响也越来越明显。主要表现在呈现教学信息、构造仿真情境、创建虚拟学习空间、丰富的信息资源和学生评估等几个方面。  相似文献   

《电场》单元检测题     

任会常 《物理教学探讨》2006,24(20):57-60

一、选择题1.下面关于电场的叙述正确的是()A.两个未接触的电荷发生了相互作用,一定是电场引起的B.只有电荷发生相互作用时才产生电场C.只要有电荷存在,其周围就存在电场D.A电荷受到B电荷的作用,是B电荷的电场对A电荷的作用2.两个半径相同的金属小球,带电量之比为1∶7,相距为r,两者相互接触后再放回原来的位置上,则相互作用力可能为原来的()3A..如74图1所B.示37,在xC.97D.176轴上关于原点对称放置两个带相同电量的点电荷q1和q2,则对y轴上一点P的场强的方向能作出的判断是()A.可能沿y轴正向B.可能沿y轴负向C.可能沿x轴正向4D..如可图…  相似文献   

AECT Internship Programs - Developing Leaders for Tomorrow     

J. José Cortez 《TechTrends》2006,50(1):6-8

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《岁暮归南山》暑作权当属孟郊考     

任智英 《河北北方学院学报(社会科学版)》2001,(5)

《岁暮归南山》素来被认为由孟浩然所作。唯韦庄《又玄集》署名孟郊。从《又玄集》成书年代与坊间孟郊已知刻本年代之比较、唐人诗互窜、“南山”争论、“不才明主弃”之辨看,此诗著作权当属孟郊。  相似文献   

研究新课标教材推进新课程改革   总被引：9，自引：5，他引：9  

任世江 《历史教学》2005,(12):40-44

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